MEC1632 datasheet(102/636 Pages) MICROCHIP

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MEC1632

DS00001592B-page 102

 2012-2018 Microchip Technology Inc.

7.4.5

32.768 KHZ SILICON OSCILLATOR

7.4.5.1

Description

The 32.768 KHz Silicon Oscillator provides a clock source for the 32K Clock Domain that does not require an external

crystal (see also Section 7.4.6, "32 KHz Clock Domain Switching," on page 103).

The 32.768 KHz Silicon Oscillator is controlled by the 32K_EN bit in the Clock Enable Register (see Section 7.9.2,

"Clock Enable Register," on page 149). When 32K_EN is asserted, there is a start-up delay (tSTART) for the 32.768

KHz Silicon Oscillator as shown in Table 7-8.

The clocks sourced by the 32.768 KHz Silicon Oscillator in the 32K Clock Domain operate as described in Table 7-23,

"Typical MEC1632 Clocks vs. ACPI Power States" (see Section 7.5.1, "Power Supplies and Clocks ACPI Context," on

page 121.

FIGURE 7-5:

32.768 KHz Silicon Oscillator BLOCK DIAGRAM

FIGURE 7-6:

32.768 KHz Silicon Oscillator TIMING

TABLE 7-8:

32.768 KHz Silicon Oscillator TIMING PARAMETERS

Symbol

Parameter

Limits

Units

Comments

MIN

NOM

MAX

fOSC

Oscillator Output Frequency

32.113

32.768

33.423

KHz

tSTART

Oscillator Lock Time

–

300

s

fOUT

32K_EN

OUT

tSTART

fOUT

fOSC

32K_EN

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